Due to the fact that I have to constantly change my regional settings and reboot my computer (due to the Unicode problem) to play the latest beta, I haven't been playing it after the first days. Rebooting is always a pain in the a**.
I didn't have the crashes many people reported (I run WinXP Pro SP2/Ati 9600XT/AMD Opteron 1.4), but the game and match loading was indeed slow. Not a show-stopper though.
Gameplay-wise, I played the game (actually, some friendlies and a Champions league round with Olympiakos and Olympiakos got disqualified again from the first round

) without a joystick, so my input can't be very accurate. It felt like playing KO2 with the keyboard - not very enjoyable. I liked the menu design - it's clear and as retro as it should. The automatic detection of a saved competition and the extra option in the main menu is very nice.
It the game, I felt the AI was cheating, but I liked the game mechanics / ball collisions / bounces. I wish that my players felt a bit more "solid" in some instances and that shooting power was stronger, but these are just minor glitches. The keepers were very stupid (en par with KO2 keepers). I also think that the difference between good and bad teams is too exaggerated - playing with Olympiakos, all my players were noticeably slower than the opponents.